<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>07_component_refs</title>
</head>
<body>
<br>
  <div id="example"></div>

  <script type="text/javascript" src="../js/react.development.js"></script>
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <script type="text/javascript" src="../js/babel.min.js"></script>

  <script type="text/babel">
    /*
    需求: 自定义组件, 功能说明如下:
      1. 界面如果页面所示
      2. 点击按钮, 提示第一个输入框中的值
      3. 当第2个输入框失去焦点时, 提示这个输入框中的值
   */

    // 1. 定义组件
    class MyComponent extends React.Component {

      constructor (props) {
        super(props)

        this.showInput = this.showInput.bind(this)
        this.handleBlur = this.handleBlur.bind(this)
      }

      showInput () {
        const input = this.refs.content
        //alert(input.value)
        alert(this.input.value)
      }

      handleBlur (event) {
        alert(event.target.value)
      }

      render () {
        return (
          <div>
            <input type="text" ref="content"/>&nbsp;&nbsp;
            <input type="text" ref={input => this.input = input }/>&nbsp;&nbsp;
            <button onClick={this.showInput}>提示输入</button>&nbsp;&nbsp;
            <input type="text" placeholder="失去焦点提示内容" onBlur={this.handleBlur}/>
          </div>
        )
      }
    }

    // 2. 渲染组件标签
    ReactDOM.render(<MyComponent />, document.getElementById('example'))
  </script>
</body>
</html>
